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| Titel |
Formation of the high-energy ion population in the earth's magnetotail: spacecraft observations and theoretical models |
| VerfasserIn |
A. V. Artemyev, I. Y. Vasko, V. N. Lutsenko, A. A. Petrukovich |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 32, no. 10 ; Nr. 32, no. 10 (2014-10-13), S.1233-1246 |
| Datensatznummer |
250121118
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| Publikation (Nr.) |
 copernicus.org/angeo-32-1233-2014.pdf |
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| Zusammenfassung |
| We investigate the formation of the high-energy (E ∈ [20,600] keV) ion
population in the earth's magnetotail. We collect statistics of 4 years of
Interball / Tail observations (1995–1998) in the vicinity of the neutral plane in
the magnetotail region (X <-17 RE, |Y| ≤ 20 RE
in geocentric solar magnetospheric (GSM) system). We study the dependence of high-energy ion spectra on
the thermal-plasma parameters (the temperature Ti and the amplitude
of bulk velocity vi) and on the magnetic-field component Bz. The
ion population in the energy range E ∈ [20,600] keV can be separated in
the thermal core and the power-law tail with the slope (index) ~ −4.5. Fluxes of the high-energy ion population increase with the growth
of Bz, vi and especially Ti, but spectrum index seems to be
independent on these parameters. We have suggested that the high-energy ion
population is generated by small scale transient processes, rather than by
the global reconfiguration of the magnetotail. We have proposed the
relatively simple and general model of ion acceleration by transient bursts
of the electric field. This model describes the power-law energy spectra
and predicts typical energies of accelerated ions. |
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